METHOD AND APPARATUS FOR USING AN ACCELEROMETER SIGNAL TO DETECT MISFIRING IN AN INTERNAL COMBUSTION ENGINE

摘要

The method comprises operating an engine and collecting a real-time accelerometer signal from an accelerometer sensor. The real-time accelerometer signal is digitized and filtered to isolate data in a frequency range associated with combustion to produce a filtered signal data set. The filtered signal data set is integrated to produce an integrated signal data set, and misfire is detected by comparing the integrated signal data set with a predetermined reference data set associated with the same operating point. The apparatus is a control system for an engine that comprises an accelerometer sensor mounted to the engine; a look-up table in which is stored predetermined reference data sets, in association with predetermined operating conditions; and an electronic controller programmed to: (i) receive real-time accelerometer signals from the accelerometer sensor, (ii) digitize and filter the real-time accelerometer signal to isolate data in a frequency range associated with combustion to produce a filtered signal data set, (iii) integrate the filtered signal data set to produce an integrated signal data set, and, (iv) compare the integrated signal data set to the predetermined reference data set to detect when misfire occurs.